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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342160b29b823ccda2ee9baa537c273fd2435f7c37e9681510b118e0eb0d871d' 
  AND token = '4M3bSxQFqyM1geGPmhWh1g2fRe0ZNmm4FxGXZiUehuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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