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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdd31f92f774ec01b6eadfc97c8b9a04ad84d424fe8c2429e1e6cf18ccd6a4d' 
  AND token = 'D4SKAQJCj65Mawv6nDV0lktKx7c+WxspBMKOECKsoMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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