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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bda77773455200a8210f51b3437b068f75854ab7b032cbc97eec4b43269588' 
  AND token = 'XNj0It6WHYNQrZvGGKtPml0UmtIzM133/OEEmAEWuyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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