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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b31bb87b8c6a4013bf1a974f7f826dc7bf986faf8c8013669e23a487e2fa481' 
  AND token = 'zBq08HfURmY774rYkh66rklJ1g9+hZzeWf6Pw/6uEYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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