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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa319c2c2afa1c1fa7953b7451c3bfb1cc77575dc9010ed1c19fa49723c7333e' 
  AND token = '8Sdb6rqou/JEj6e3T1Wi8AKaSHrwlvkfnH58bV5TBDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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