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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2203322132e3f6c3a42af011fb3b0682fa2b9ff20f71ac644fb45113167e0249' 
  AND token = 'ALsLjNCb2EvROhwPmRlJ3baIJcP4GCqy4rpkg6jVFtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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