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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ccb22003fcb7c25832a5ce40d5b7adf68bbc8a8f2f824c454c9a712d9192e7' 
  AND token = '4/XpOsLCKm9bt3bKAYqvsKd9QX++B1U2BrnTXlm+Lpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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