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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0afcf0cf3b2ee2ad2da6dea8753db8e57c9f7cf81f0aefa47603a39d0a883a' 
  AND token = 'WWWjfGggsowboEE0ynHcPcVgEeF/53yl4+OO2jA9LGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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