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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096e0fddc8b6494c79e49c9c0733f48ce5e461f8979a26061b7f552895081db3' 
  AND token = 'iGRRSIZ7Tqswq7+Cawux8ljj+syAXbu1iTqUicyfqMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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