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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd181defa118bb80cfd6cc11f9cf923e5a0785550fa3868f6de13bb4eb1fc807' 
  AND token = 'rRhi7RH2+xFSo0BArCAqbn9LwsYdGbmMHLE3Z3RAO/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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