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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4422a335fd8f3eb0ba8960514bbbe34325bc2edbc162499be0bc6df4e3a4b8' 
  AND token = '9ODZ6+DWPEe6FVijDzyjDsXa19rM6dZ8LmhMg6m10e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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