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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e18e4c9be70effdc9b6db96b1ce500764268759b9bc184e15d6a35e830684f' 
  AND token = 'pCJYdmnRPdhnDD+IVVpTCgzFyN0vQi92BzZeZbYMDy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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