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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e43ae75c0d9be787559116bdec408dc5bd5c6a75cccc064dbb053042944a87' 
  AND token = '8MqN7P5KgT6r2i/9HDpfCEwtaz/9ZOsSXv+vhny/W20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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