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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eec19311ce2740f87b7852bbb424ec1ede1dd979f15555f5850691c0903af9d' 
  AND token = '6hLY4u6Gan3PwEdXyMQkPXIoUZ839fHnbAZZj03i9RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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