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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119f2f4543aed57422c5d8e8ab4a76373d9a877341b283cbac9b69a28ab1eef2' 
  AND token = 'gxQjIA6jTKCdyqyDBeY8BokvAaqU2dpMgnptpE+6vdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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