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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523f2f19b623b0d64664682afee92d9658b8b85e3c90612e99f2a61b49bbf53e' 
  AND token = 'lRe3NgUzdkNN6EKusnUHkSHQJaPpgu7RB9M8Ri3dNWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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