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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cbedbf8383228d2fb61966e9af27392258181a057d9961d67ed73311c3de3d' 
  AND token = 'erTWAsg064PpKFxUZm8YWCTc9OH3A99xdJQoHuh3Jac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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