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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f34bbf0379c16b1956c4afad9d4219f4cd2812af5accc0b37aa4583ab3cdcf' 
  AND token = 'F7jjiRbHh3XImpOTRmxNbI2Qez7lnQ4Q03F6qm89rJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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