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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68e882ed57a8397c14ae0a0219f1017b55cc0708a38dc6ccffa1f6728927483' 
  AND token = 'b1koumot2YHrs6zUXhlK+QlP9GExVZ02XbUulbeIai0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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