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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a03060a8f9d07b9655fa3b546ca548ef6029cd0ec1e1654d8c2f512eb03385' 
  AND token = '7Taolk1YTDdh/zHDm8IYwqxKr+fLD1oq1jKOlNb7TSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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