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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0107c8f187a6c278e0966ed4cf63b522969c043244d5182efa4fad9df0993026' 
  AND token = '7d0fPB+zPzIooXMVlnB0DL39tonfJo59ExB/miYqDIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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