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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98da61f8b232cf8fe9e5d52b2702d045f501bc46a49f428b0ef9df4e80e0702' 
  AND token = 'CJHNKuMC2pLiupeinaK8rRSGbJ0LaxMrBmWAt94Hdyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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