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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c44444f1bf23457e17ab18ca3309628ef7677e799388ba65fadb98d9ed823f' 
  AND token = '9U8C+c1fmqv60tOnpMZM1RDpHksca6UnWMU8h3Op/cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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