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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c162fc30493f62ac07bad22257d0c0a99585ea70d8d5c39995fedd94b2617d' 
  AND token = '5HXIoFpo1yot4Dh8+pDj0dw8HU84BHeDjKCadZSJ9w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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