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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a178af4fc9e2ae224fa784ebebda2a46ec8d9257e5cddeab1f6658152b7dc73' 
  AND token = '7EDv08B5d2eICpC8luBQ62ZzWk2oGNwCH81bsuaA4CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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