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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57eac352c077aa7ec1ea698922d7d907d5cc1c222bdb0f3c3e7b63603890be78' 
  AND token = 'x6xWqORDoZQqaEaD2CCVqKZCWU2hZl1a9JlqcX/xrsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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