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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3f3023c59dda6190c55d4d64e65ea7a95ae0c42f6982b979807dc808a7f5da' 
  AND token = 'sOrX/Su69B2WPOcAP7TMN1wS7yZD7QvXzZPb13dDDWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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