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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039ee814646c6e12c61007f3a6e63e4901c2c50553f384b351ca6bc5fb1b6551' 
  AND token = 'wrnC0ngo2YsBOu46Z/5vgv3SNRpEm/2L7coAFBdXHOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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