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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0162e6f69594b8c449cee9e122cb4bfae207f57c8ab56779ec920df232da50' 
  AND token = 'fHJsxq7S+pYfTLfau0WOHviD/OtxSywCgOEs/ZgpD+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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