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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6704834500c5891ba5c0ae360b71476220fcd03ade68c1676e7f346945ca61' 
  AND token = 'kTG6M8xNBs6KblIgR6NS8NceRIJn4HhsgLvwBJnR/dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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