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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f55d5dc549153eea8d3899498552a08f4cc6b872a7fa0143513f7b31a3341d' 
  AND token = '9tpoKzZ1hBp/RNS36ol2I1PRw7npV9ts1c4/DgTmvoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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