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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5842049294059c7c50b01b9855caa8444bc02b73d45559c28d8f7bad094e1b' 
  AND token = 'rUuJdqMcR0F/AZoJ30fgHonl8cLpZ8RcWKrlRINBkac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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