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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9335ad603fd74674fc1b849b211a2db4fe5905eb0a60ceb403dd64a9b5a8dc9d' 
  AND token = 'lenzgXZN3AZ5WFwKlrTyOyHrpNoQlwa96A4bHenRVXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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