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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e1d83a561c7c0b292e1fc3cac3bcc13f212c378b5280930c93bdab26974a6c' 
  AND token = 'sSzBe2lVeglaiMpRT9Yz3trsb6C1eEl4qrJEvr6WXr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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