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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53c5cf128758c31820c76fab923b5a97347382cc31b1d612b582f7527c786e4' 
  AND token = 'j5qI5dn02924kaYOmCYjv1ip09PaPfFfBu3IxiG/40Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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