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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e5dab7a2d3b5c9c428540bf9ed6e2ac475ede7b29243b7efb7aa10446cbff3' 
  AND token = 'Oz5FTR4eIWumtZUII0cA5OMBQEkL7x/7WC8oBpiWC7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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