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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52573e1edf6b524d4d2caaf00aff4296fda5ed185241e3ed73cb359b04b334aa' 
  AND token = 'aR4vVaR9iINA7kuHHzwL64Z96RrC8eahf3dZcBHqzxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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