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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8d4eedfae3d2e916ca0d61f48771296a8ca5066c9f498bfbc35cc846045c7d' 
  AND token = '1VJm/f01AxgpxAltMNyHJDBBUDHcab1JFCbUjhS3EF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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