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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963d2320043476769e0d78554e22f29e60d184c0099cd17e615c3d6fcfd558b5' 
  AND token = '0TSFTvkDC8+R5nUghBMmCccqcxF0cZZvsRcgFPLBNiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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