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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609cda2047755e72e389a4b07234999d9baac8a01d3fc464439a743f2ed162d7' 
  AND token = 'PWiv6OO+jjL/zGmQx9R6AwoO3MAtHexdcyxoyj8NyTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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