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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128b029a66887f560a458ee0c422fb37286a8feb3ae2bd82afd0538d9db964e2' 
  AND token = 'RAzz/KU3asgUMS2K+JoHdOyP9yGRO3YN4EiEfnbsRhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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