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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9130856cfc0cee69156e68c4cff9ad3f574fdbf6dd0be7e0361b3ad4d4872958' 
  AND token = 'g9vWT9rh6mXcOb5Y97ZGo7O2vucv9NZR79PqcA27+9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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