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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec9f1e37c860e97e6bace270d39f8f4315b42385f4efa9fc07e4f0d317a68de' 
  AND token = 'ygniAImn+0g701kDHvzUHFFuP1Kn6pA9xJGGPpeZj5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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