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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bd230b909bc382c36b81f638284a194dc5e40e45a4b19f65ae9b4db0384a46' 
  AND token = '2PVOs1NtOq28Kkcc8YBYgtXTv/q8WAUqFR5aoUdnOy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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