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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a9cd358c94c03bed2055697ea52c63ff66cce75584006f70aa20bf73c6cb90' 
  AND token = 'xJTbbLwuKH6qEeMvUFzZxAE387gBfKv/EIE4DVkuv4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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