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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0982b9f68982560811f4d7ac3aa4fed1c28bfdf33466327bddf2585a04eef173' 
  AND token = 'UX9qgygTGzHwHgHx8qT8ec4fkI6bLm+12EXH4+ru2xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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