SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fcfb458551719a22e2c6a1d06b23822a79024e701a0f28e40c8f6804a5f82e' 
  AND token = 'zVSoNljtRQYuoWSWzusOoMPkupP3hp7L3BFYgvblqog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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