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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0bb59faf34ab6cae9dee035e391e2599f4a96dedbe0a7d2d47ba9a6c65428e' 
  AND token = '4KbuHN0N24uk1O1FWLT2iHT/LcLt/ljsEgPxFru4o1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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