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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e0bfccc1fa176a1bdcf3e589f4872db60b003361abb76b45928fd4de78493d' 
  AND token = 'tqb0OmvueAdNo9vWswZkgh0teK18XMO/5ql050cnVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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