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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c361789cc846d892a6eaee3b2101fc814c7ded58ba9729fa2da16950c2cf4c' 
  AND token = '8aGturArUHm6Nk5m0NvJGV97tdgrCHEVtJC8l4xohHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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