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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc751c77d24845b2bdfc3c95d85f005f9575b3389fe9ea51029d456f2488b48' 
  AND token = '07ciXuG9AbtsOVdqF2bhtmUjSNqAF4LhcHDCD5znX+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}