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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd304cce91c98ed177f638d348b485a227c91d5db10102f85a530250af87071' 
  AND token = 'xRuoN4sUYh6tQ20zo/5u4zOApf2xqPtvGYLuVDuAJOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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