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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea9c7decf0f4850a63df1141aacc86898a0f9d225e3535fefc67a2b343b6b8e' 
  AND token = 'QBWzp6+gqpIWO19ynP7Jq8NmyLofDqYObtQSImDoYSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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