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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e67d7c194308369e3f1d1500cc6f551f8acac3e6d145b5e530e71840951921' 
  AND token = 'eN+uRgz9U32lkR3H2PRcctD6Slu4TlFWIwvd5M7i3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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